JPH0893919A - Seal part of oil pan - Google Patents

Abstract

PURPOSE: To provide an improved new seal part for providing a fluid-tight seal between an oil pan and a mounting member, which have been improved on the cost, seal performance and operability, compared with a prior liquid-like gasket system and plate gasket system. CONSTITUTION: A mounting flange 2 provided on the peripheral edge of the upper surface of an oil pan 1 is formed with a bottomed groove 4 circulated along the flange, and a strip-like elastic rubber seal material 5 is attached to the groove 4. When the oil pan 1 is mounted on a mounting member 8 like a cylinder block, the elastic rubber seal material 5 is compressed to seal the joining part between the mounting member 8 and the oil pan 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal portion for an oil pan of an automobile engine, a transmission or the like.

[0002]

2. Description of the Related Art An oil pan attached to a lower portion of a crank chamber of a cylinder block of an engine or a lower portion of a transmission case to retain lubricating oil therein has heretofore been applied on a surface of a mounting flange around a peripheral edge of an upper surface of the oil pan. A liquid gasket or a plate gasket mounted on the mounting flange seals between the cylinder block and a mounting member such as a transmission case.

[0003]

When a liquid gasket is applied to the mounting flange of an oil pan for sealing, it is necessary to degrease the surface to which the liquid gasket is applied before applying the liquid gasket. However, when repairing and reassembling the oil pan, it is necessary to remove and dry the liquid gasket that has adhered to the surface of the mounting flange of the oil pan and has been dried and solidified. Therefore, a great deal of labor is required for preparatory work before applying the liquid gasket. In addition, an expensive dispenser facility (coating device) is required for applying the liquid gasket.

Further, a liquid gasket is applied on the surface of the mounting flange of the oil pan, and the liquid gasket is mounted on the lower portion of a mounting member such as a cylinder block or a transmission case with bolts. Since it takes time, it is necessary to leave the mounting member with the oil pan stationary during this time, and not only does it require a space for that, but if it is impacted or internal pressure is applied before it is completely dried, However, there is a risk that the liquid gasket will stick out locally and lose its sealing function. Moreover, when the mounting surface of the mounting member or the surface of the mounting flange of the oil pan is greatly deformed by heat and external force, the liquid gasket cannot follow this and there is a risk of oil leakage.

When the plate gasket is mounted and sealed on the surface of the mounting flange of the oil pan, not only is the plate gasket non-asbestos-free and costly, but also the mounting flange is used in the assembly line of the automobile manufacturer. It is not preferable because the oil pan equipped with the plate gasket is assembled to the cylinder block or the mission case.
In addition, the plate gasket may be worn out during long-term use, and the mounting bolts may loosen, resulting in oil leaks, and the followability to the deformation of the sealing surface is greater than in the case of the liquid gasket described above. If the deformation of the surface or the surface of the mounting flange of the oil pan is large, there is a risk of oil leakage. Further, as in the case of the liquid gasket, it is necessary to remove and clean the plate gasket firmly attached to the mounting flange surface of the oil pan or the mounting surface of the mounting member at the time of repair and replacement.

Whether the oil pan and the mounting member such as the cylinder block and the transmission case are sealed with a liquid gasket or a plate gasket, the conventional method is cost-effective as described above. There are many problems in terms of surface, sealing performance and workability, and improvement is desired. The present invention has been made in view of the above points, and an object of the present invention is a conventional liquid gasket system, with respect to a seal portion that seals between an oil pan and a mounting member.
It is an object of the present invention to provide a novel seal portion which is significantly improved in cost, sealing performance and workability as compared with the plate gasket method.

[0007]

A structure of the present invention for achieving the above object will be described with reference to FIGS. 1 to 3 corresponding to an embodiment. A bottomed groove 4 that circulates along the flange 2 is formed in the mounting flange 2, and a string-like rubber elastic sealing material 5 is formed in the groove 4.
When the oil pan 1 is mounted and the oil pan 1 is mounted on the mounting member 8 such as a cylinder block or a transmission case, the rubber elastic seal member 5 is compressed to seal the joint between the mounting member 8 and the oil pan 1. It is characterized by what is done.

Further, referring to FIG. 5 corresponding to another embodiment, a mounting flange 21 provided on the peripheral edge of the upper surface of the oil pan 1 and a mounting surface 21 having a bolt hole 3 and a mounting surface 21 having a bolt hole 3 or more. The sealing surface 22 located below is formed, and the string-like rubber elastic sealing material 5 that circulates along the mounting flange 2 is fixed to the sealing surface 22, and the oil pan 1 is attached to a cylinder block, a mission case, or the like. The rubber elastic sealing material 5 is compressed when it is mounted on the mounting member, and the joint between the mounting member 8 and the oil pan 1 is hermetically sealed.

[0009]

In the seal portion of the oil pan according to the present invention having the above-described structure, the rubber elastic seal material 5 is integrally attached to the mounting flange 2 of the oil pan 1 in advance, so that the oil pan 1 is used in automobile manufacturers. Bolts 9 on the mounting member 8
You just need to assemble with, and when assembled like this,
The rubber elastic sealing material 5 is appropriately compressed, and the joint surface between the oil pan and the mounting member is sealed. Therefore, the automobile manufacturer does not need the man-hours required for applying the liquid gasket and assembling the plate gasket, which improves the workability and reduces the cost.

Further, in the present invention, since the rubber elastic sealing material 5 is rich in elasticity and has a high followability to the deformation of the sealing surface, the surface of the mounting flange 2 of the oil pan 1 and the mounting member 8 such as the cylinder block and the transmission case can be made. Even if the mounting surface 80 is deformed by heat or the like, the sealing property is maintained well, and there is no risk of oil leakage. Furthermore, since the fastening portion of the bolt 9 for mounting the mounting flange of the oil pan to the mounting member 8 is a metal-to-metal contact without a liquid gasket or plate gasket or the like intervening, the interposed liquid gasket or plate gasket or the like causes There is no danger of loosening the tightening force, and good sealing performance can be maintained for a long time.

[0011]

The details of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a top view of an oil pan having a seal portion according to the first embodiment of the present invention, and FIG. 2 is a sectional view taken along line AA of FIG. FIG. 3 is a sectional view showing a state in which the oil pan having the seal portion of the first embodiment shown in FIGS. 1 and 2 is attached to the lower portion of the cylinder block of the engine. FIG. 4 is a sectional view similar to FIG. 3 of the second embodiment of the present invention. FIG. 5 is a sectional view similar to FIG. 2 of the third embodiment of the present invention, and FIG. 6 is a sectional view similar to its modification. In each figure, the same reference numerals indicate the same parts.

1 to 3, the oil pan 1 is provided with a mounting flange 2 around the periphery of the upper surface thereof. The mounting flange 2 is provided with a plurality of bolt insertion holes 3, and the mounting flange 2 is provided with a bottomed groove 4 which extends along and extends around the bolt flange 2. The bottomed groove 4 can be formed at the same time when the mounting flange 2 is press-molded. Further, the portions other than the corner portions do not have to be linearly extended as shown in the figure, and may be appropriately bent or curved. 6 is a side wall of the oil pan, and 7 is a bottom wall. A rubber elastic seal material 5 in the shape of a cord is charged and mounted in the bottomed groove 4. The rubber elastic sealing material 5 is made of, for example, NBR, silicon rubber, acrylic rubber, fluororubber, or the like, and cuts a long string-like body according to the length of the groove 4, and cuts the cut surfaces into a butt ring shape to form the groove 4 in the groove 4. Insert and wear.

At this time, the rubber elastic seal material 5 slightly protrudes from the upper surface 20 of the mounting flange 2 of the oil pan, and as shown in FIG. 3, the oil pan on which the rubber elastic seal material 5 is mounted is a cylinder. When it is assembled to the lower part of the mounting member 8 such as a block or a mission case with the bolt 9, it is appropriately compressed by the mounting surface 80 of the mounting member, and the joint between the oil pan 1 and the mounting member 8, that is, the oil pan 1
The upper surface 20 of the mounting flange and the mounting surface 80 of the mounting member 8 are sealed. In addition, the rubber elastic seal material 5 is attached to the bottomed groove 4
The rubber elastic seal material is securely fixed to the groove 4 by its elasticity when mounted on the. However, in order to further enhance the safety against the rubber elastic seal material 5 coming off the groove 4 during transportation and handling of the oil pan. Alternatively, an adhesive may be previously spotted on the groove portion 4 when the rubber elastic sealing material 5 is mounted.
In addition, o in FIG. 3 has shown the oil in an oil pan.

In the second embodiment shown in FIG. 4, the mounting flange 2 of the oil pan 1 is mounted on the mounting surface 21 by the step portion 23 and the sealing surface 2 located slightly below the mounting surface 21.
2, the mounting surface 21 is provided with a plurality of bolt insertion holes 3, and the lower sealing surface 22 is provided with a bottomed groove 4 that extends along the mounting flange 2 and circulates. A rubber elastic sealing material 5 in the form of a string is attached to the groove 4. The other points are the same as the case of the first embodiment including the assembling to the mounting member 8.

In the case of the second embodiment described above,
Since the sealing surface 22 is formed so as to be located below the mounting surface 21, when the oil pan 1 is mounted on the mounting member, the sealing surface does not interfere with bolt fastening and is firmly fixed. The bolts can be fastened, and the bolt fastened parts are surely brought into contact with each other to prevent the bolts from loosening.

In the third embodiment shown in FIG. 5, the mounting flange 2 has the mounting surface 21 provided with the bolt insertion hole 3 by the stepped portion 23 and the seal located below the mounting surface 21 as in the second embodiment. The work surface 22 is divided. However, the bottom surface groove 4 is not provided in the sealing surface 22, and the string-like rubber elastic sealing material 5 having a semicircular cross section is directly fixed to the sealing surface 22 by an adhesive so as to circulate along the mounting flange. are doing.

In the modification of the third embodiment shown in FIG. 6, the sealing surface 22 is provided with a recess 24, and the rubber elastic sealing material 5 having a substantially semicircular cross section fills the recess 24 and covers it. It is fixed. In this case, the rubber elastic sealing material 5 is more firmly fixed than that shown in FIG. 5, and the compression margin is increased by the depth of the groove, so that the followability and the crush resistance are improved.

In the above-described first and second embodiments, the cross-sectional shape of the string-like rubber elastic sealing material to be fitted in the bottomed groove 4 is shown only as a circle, but of course it is not limited to this. Instead, for example, rubber elastic sealing materials having various sectional shapes shown in (a) to (f) of FIG. 7 can be advantageously used. The rubber elastic sealing material having the cross-sectional shape shown in (a) and (b) of FIG. 7 has improved holding property when mounted in the bottomed groove 4, and there is little risk of falling off from the groove 4. The rubber elastic sealing material having the cross-sectional shape shown in FIG.
When assembled in, a plurality of seal lines are formed to improve the sealing property.

FIG. 7 (d) shows a rubber elastic seal member having a recess on one side thereof so that the vertical direction of the rubber elastic seal member can be easily identified. Improves workability when mounted on 4. Figure 7 (e)
What is shown in (1) is a rubber elastic seal material having a hollow circular cross section having a hollow portion 51 in the center, and even if there is a locally large compression margin of the rubber elastic seal material due to insufficient processing accuracy of the bottomed groove 4 etc. There is an advantage that the elastic sealing material is not likely to be crushed. FIG. 7 shows a rubber elastic sealing material containing a core material 52 such as a wire.

[0020]

The seal portion of the oil pan according to the present invention has the structure described above and operates as described above. Therefore, the seal surface, that is, the mounting surface of the mounting member or the surface of the mounting flange of the oil pan is Since the followability to deformation is high and the sealing property is good, and the bolt fastening part is in metal contact, the bolt does not loosen due to the fatigue of the gasket, and the sealing performance can be maintained well for a long time. Further, since the rubber elastic sealant is integrated with the oil pan, there is no risk of forgetting to apply or forget to assemble, which often occurs in the conventional liquid gasket or plate gasket.

Further, according to the seal portion of the oil pan of the present invention, as described above, not only the workability in the automobile manufacturer is improved and the cost can be reduced, but when the inexpensive rubber such as NBR is used, the conventional method is used. Material cost can be reduced as compared with the plate gasket. It does not require expensive equipment such as dispenser equipment as in conventional liquid gaskets.
Further, when the rubber elastic sealing material is mounted in the bottomed groove as in the first and second embodiments of the present invention, there is an advantage that the sealing surface can be easily cleaned at the time of repair.

[Brief description of drawings]

FIG. 1 is a top view of an oil pan including a seal portion according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a cross-sectional view showing a state in which an oil pan having a seal portion according to the first embodiment of the present invention is attached to a lower portion of a cylinder block of an engine.

FIG. 4 is a sectional view similar to FIG. 3 of the second embodiment of the present invention.

FIG. 5 is a sectional view similar to FIG. 2 of the third embodiment of the present invention.

FIG. 6 is a similar sectional view of a modification of the third embodiment.

7 (a), (b), (c), (d), (e) and (f) show the cross-sectional shape of the string-like rubber elastic sealing material according to the present invention, respectively.

[Explanation of symbols]

 1 Oil pan 2 Mounting flange 3 Bolt insertion hole 4 Bottom groove 5 Rubber elastic seal material 8 Mounting member 9 Bolt

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Teruaki Kawanaka 1-5-2 Fukaminishi Yamato-shi, Kanagawa Nihon Lines Co., Ltd. (72) Fumio Kishi 1-5-2 Fukaminishi, Yamato-shi, Kanagawa No. Nippon Lines Co., Ltd.

Claims (4)

[Claims] 1. An oil pan in which a bottomed groove that circulates along the flange is formed in a mounting flange provided on a peripheral edge of an upper surface of the oil pan, and a string-like rubber elastic sealing material is mounted in the groove. When attached to a mounting member such as a cylinder block or a transmission case, the rubber elastic seal material is compressed,
A seal portion for an oil pan, characterized in that a joint portion between the mounting member and the oil pan is sealed. 2. The oil pan seal portion according to claim 1, wherein the bottomed groove is formed on a sealing surface located below a mounting surface having a mounting bolt hole. Bread seal part. 3. A mounting flange provided on the peripheral edge of the upper surface of the oil pan is provided with a mounting surface having a bolt hole and a sealing surface located below the mounting surface, and circulates along the mounting flange. When a string-shaped rubber elastic sealing material is fixed to the sealing surface and the oil pan is attached to a mounting member such as a cylinder block or a transmission case, the rubber elastic sealing material is compressed to separate the mounting member from the oil pan. A seal part for an oil pan, which is characterized in that the joint part is sealed. 4. The seal portion of the oil pan according to claim 3, wherein a recess is formed on the sealing surface so as to surround the periphery of the oil pan, and a string-shaped rubber elastic sealing material fills the recess. The seal part of the oil pan, which is fixed so as to cover it.